T89C51AC2-SLSIM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

T89C51AC2-SLSIM

Enhanced 8-bit Microcontroller with 32 KB Flash Memory

Atmel Corporation 

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Registers

Table 39. TCON Register

TCON (S:88h)

Timer/Counter Control Register

7

6

5

4

3

2

1

0

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0

Bit

Bit

Number Mnemonic Description

Timer 1 Overflow Flag

7

TF1 Cleared by hardware when processor vectors to interrupt routine.

Set by hardware on Timer/Counter overflow, when Timer 1 register overflows.

Timer 1 Run Control Bit

6

TR1 Clear to turn off Timer/Counter 1.

Set to turn on Timer/Counter 1.

Timer 0 Overflow Flag

5

TF0 Cleared by hardware when processor vectors to interrupt routine.

Set by hardware on Timer/Counter overflow, when Timer 0 register overflows.

Timer 0 Run Control Bit

4

TR0 Clear to turn off Timer/Counter 0.

Set to turn on Timer/Counter 0.

Interrupt 1 Edge Flag

3

IE1 Cleared by hardware when interrupt is processed if edge-triggered (see IT1).

Set by hardware when external interrupt is detected on INT1# pin.

Interrupt 1 Type Control Bit

2

IT1 Clear to select low level active (level triggered) for external interrupt 1 (INT1#).

Set to select falling edge active (edge triggered) for external interrupt 1.

Interrupt 0 Edge Flag

1

IE0 Cleared by hardware when interrupt is processed if edge-triggered (see IT0).

Set by hardware when external interrupt is detected on INT0# pin.

Interrupt 0 Type Control Bit

0

IT0 Clear to select low level active (level triggered) for external interrupt 0 (INT0#).

Set to select falling edge active (edge triggered) for external interrupt 0.

Reset Value = 0000 0000b

62 A/T89C51AC2

4127H–8051–02/08

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